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When a switch receives a frame with a source MAC address that it has not seen previously, the switchwill:

a drop the frame because it's not from a known source

b learn the MAC address and place in it in the MAC address table for the port that

the frame entered

c flood the frame to all ports because the source MAC is unknown

d learn the source's IP address and add the address to the switch's address table

e none of the above



What happens if you enter the command arp -a in a Windows command prompt?

a. you see a list of active network connections

b. The workstation sends out an ARP request to find a MAC address

c. Nothing because only switches keep lists of addresses

d .You see a list of IP addresses and matching MAC addresses that the workstation has in

its memory

e None of the above


A workstation is configured as follows. What is wrong with the configuration?

IP address: 172.16.3.61

Subnet mask: 255.255.255.192

Default gateway: 172.16.3.1


a There is no problem with the configuration.

b The default gateway is not a valid host address.

c The workstation has been given a network address.

d The default gateway is on a different network/subnet from the workstation.

e The subnet mask is not valid.


A PC configured to obtain its IP address using DHCP, will obtain its Layer 2 address from:

a The Administrator

b. DNS Server

c Nearest switch

d. None of the above

e DHCP Server


A host is configured as 192.168.5.5/24, with default gateway 192.168.5.100. In attempting to deliver a packet to destination 192.168.5.206, it will ARP for the MAC ID associated with IP:

a 192.168.5.100

b. 192.168.5.5

c 192.168.5.1

d. none of the above

e 192.168.5.206


A UDP datagram gets lost in transit. Which statement best describes what will happen?


a The Receiver will send a NAK requesting a replacement datagram

b The Sender not receiving an ACK will resend the datagram

c The Receiver will send an ICMP destination unreachable message to the sender

d Nothing will happen

e none of the above


The TCP Sequence and Acknowledgement Number are used to provide which transport services? (select one answer)


a Reliable, Ordered Delivery

b Packet Rate Control

c Bandwidth Measurement

d Track Bytes Transferred


A TCP/IP packet is seen on the network and the source port is 49681 and the destination port is 443.

Which statement is most probable?


a The packet is coming from a client and is heading towards a server

b The packet is coming from a server and is heading towards a client

c The packet is an exchange between to routers

d The packet is being used to exchange data between 2 server applications

e none of the above


Which of the following utility allows you to query the DNS database from any

computer on the network and find the host name of a device by specifying its IP address, or vice versa?

a. ipconfig

b. nslookup

c. tracert

d wireshark


Which device is used to reduce the size of a collision domain?

a Server

b Switch

c Hub

d Repeater


What makes a transport layer protocol connection-oriented?


a each end device is connected by a point to point link

b each end device sends an indication that it received a data segment

c there is a physical layer connection between two end devices

d end devices are connected by source and destination port numbers


As a developer of networked applications for the online banking industry, which of the following protocols should you use to ensure your customers' sensitive information is encrypted while it travels over the network?


a AAA

b HTTPS

c None of the answers!

d HTTP


A NAT device must change which of the following items on a packet leaving its internal network?


a Destination MAC Address

b Source MAC Address

c Source IP Address

d Destination IP Address


A student examines their work at the end of a lab and sees an entry for "0.0.0.0/0" in the routing table.

Why would this entry appear?


a It is a mistake; it should never appear in a properly configured device

b It is the default route

c it is an interface that has not been configured, so it gets a default address and

mask of 0.0.0.0/0

d It is a loopback, which shouldn't have a real IP address since it doesn't have an

actual physical interface.

e It represents the broadcast address for Ethernet


A server hosts two applications: web server and DNS. When a PC sends a message to the server, how does PC indicate to which application the message is being sent?


a it uses different IP addresses in the IP header

b it uses the source and destination port number to determine to which application

the message is being sent.

c it uses well known port numbers in the TCP header

d it uses information in the application layer to determine which application is required


Which of the following is not a TCP/IP Application layer protocol?

a FTP

b. SMTP

c Telnet

d. ARP

e HTTP

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